Wikipedia
a transhuman is a being that resembles a human in most respects but who has powers and abilities beyond those of standard humans.
Wiktionary:
- An enhanced human
- A being that transcends humanity; a superhuman being.
Merriam-Webster:
Trancending human limits : superhuman
Oxford english dictionary
Beyond the human; superhuman.
None of those make it inherently anti-human. That's like saying a man who wants to be a woman is also anti-man.
If I want to be stronger or smarter or anything through technological means, why would that make me anti-human? I can even be prohuman despite being transhuman.